Shakespeare's Sonnets: How careful was I when I took my way

How careful was I, when I took my way,Each trifle under truest bars to thrustThat to my use it might un-usèd stayFrom hands of falsehood, in sure wards of trust;But thou, to whom my jewels trifles are,Most worthy comfort, now my greatest grief,Thou best of dearest, and mine only care,Art left the prey of every vulgar thief.Thee have I not lock't up in any chest,Save where thou art not, though I feel thou art,Within the gentle closure of my breast,From whence at pleasure thou may'st come and part, And even thence thou wilt be stol'n, I fear, For truth proves thievish for a prize so dear.